text: In a more general case, The Tafel equation can be also written as:
  where
  * n is the number of electrons exchanged, like in the Nernst equation,
  * k is the rate constant for the electrode reaction in s,
  * F is the Faraday constant,
  * C is the reactive species concentration at the electrode surface in mol/m,
  * the plus sign under the exponent refers to an anodic reaction, and a minus sign to a cathodic reaction,
  * R is the universal gas constant.
  *  is the "charge transfer coefficient", the value of which must be between 0 and 1.